Dual-Band Patch Antenna With Filtering Performance and Harmonic Suppression

Abstract

Abstract-A novel design of dual-band antenna with integrated filtering performance is proposed. A low-profile aperture-coupled U-slot patch antenna is employed for dual-band operation with a uniform polarization, which is fed by a dual-mode stub-loaded resonator (SLR). The U-slot patch works as a dual-mode resonator of the dual-band filter as well as the radiation element. The odd-and even-mode of the SLR are coupled and tuned with the U-slot patch, generating two 2 nd -order operation bands at 3.6 and 5.2 GHz. Compared with the traditional patch antenna, the proposed antenna exhibits improved bandwidth and frequency selectivity. In addition, the bandwidths can be controlled by adjusting the coupling strength between the SLR and the patch. Furthermore, the higher-order harmonics can be suppressed over a broadband without increasing the footprint of the design. Measured and simulated results agree well with each other, showing an excellent performance in terms of impedance matching, bandwidths, 2 nd -order filtering, out-of-band rejection, cross polarization discrimination (XPD) and gains at both bands.Index Terms-Dual-band, bandwidth, 2 nd -order, filtering, U-slot patch, harmonic suppression.

Dual‐polarized filtering antenna with harmonic suppression for base station applications

“…The singly‐polarized antennas have wide harmonic suppression bandwidth, but they cannot be extended for dual‐polarization easily. Compared with the above techniques, the method of combining filter circuits with antennas is a good choice to realized harmonic suppression due to their simple structure and high integration . However, the filtering antennas in References have a narrow operating bandwidth.…”

“…Compared with the above techniques, the method of combining filter circuits with antennas is a good choice to realized harmonic suppression due to their simple structure and high integration . However, the filtering antennas in References have a narrow operating bandwidth. In addition, the integrated filtering circuits in References and have a large dimension, which is not conducive to its application in this design.…”

Differentially fed, dual‐band filtering antenna with H‐shaped slot

“…In recent years, antennas with filtering responses are studied with various methods. In some designs, filters are integrated into feedlines of antennas . As the antennas and filters can be individually designed, the design process is easier for antenna engineers.…”

A compact low profile dual‐polarized filtering antenna with metamaterial for wideband base station applications

“…Typically, some of the new antennas have been studied and designed . A band‐pass filter is used to transmit the energy to the antenna, forming a good filtering antenna.…”

“…However, this filtering antenna is also formed by cascading the antenna and filter resonator, still has a large size. There are several multi frequency filtering antennas . These filters have good multiband characteristics, but they do not achieve dual polarization, which cannot be applied to multi‐channels communication system.…”